James m



(No Model.)

Patented Nov.. 2,

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N, PETERS. Fhelo-Lilhvgmphr. Washington. D. C.

' f UNiTnDy STATES` PATNT OFFICE.

JAMES M. HALSTED, OF OAKLAND, CALIFORNIA.

TEMPERATURE-REGULATING. DEVICE FOR INCUBATRS.

SPECIFICATION forming part of Letters Patent No. 352,053, dated November 2, 1886.

Application filed July 9, 1884. Serial No. 137,278. (No model.)

To all whom 15 may concern:

Be it known that I, J Aivrns M. HALsrED, of the city of Oakland, in the county of Alameda and State of California, have invented an Improvement in Devices for Regulating Temperature; and I hereby declare the following to be a full, clear,and exact description thereof.

My invention has special relation to regu` or egg-chamber, which may be of any suita` ble construction, and B is' an air chamber, made of metal or any material, fixed within the incubator. From this air-chamber, near one end, a tube extends downward through an opening in the ioor of the egg-chamber, and far enough to dip into a cup, D, vwhich is suspended below, as follows: A bracket, E, is secured beneath the floor of the eggchamber, and the lever-arm F has its fulcrum within thisbracket. The cup D is secured to this lever-arm at one side of the fulcrum, in a line beneath the tube G, and a weight, G, is secured at the opposite side at such a point that it will counterbalance the cup and the liquid contained within it. This liquid may be water or any other, but is preferably one which will not rapidly evaporate or be subject to Vother unfavorable changes. Glycerine fills these requirements very satisfactorily.

The arm of the lever to which the cup D is secured is connected with a means for increas ing or decreasing the temperature. In the. present case I have shown the rod H extending from the lever downward, and connecting with a lever or other mechanism by which the flame of the lamp I may be raised or lowered. Upon the lever F is a small weight, J, which may be moved from the fulcrum toward the cup, if it is necessary to increase the weight; or it`may be hung upon the opposite side of the fulcrum,if it is necessary to counterbalance the Weightof the cup.

The operation of this regulator will then be as follows: The air in the egg-chamber is heated to the desired degree, which in the present case is 103, and the screw;7 K, which controls the aperture in the air-chamber B, is put in tight. This closes the chamber, withthe exception of the opening in-the lower end of the tube C, The body of air within the air-chamber being of .the same temperature as that outside and within the egg-chamber, if the teml perature Within the egg-chamber be increasedr a little, that AWithin the air-chamber will be correspondingly increased, and the air will expand and force a portion of the iluid contained in the tube out into the cup. This makes the cup heavier than it was, and it sinks, carrying with it the end of the lever F, which,throu gh the connection H, operates upon the lamp-wick, so as to reduce the llame, and this decreases the heat within the chamber. If the heat within the egg-chamber decreases, the temperature of the air-chamber has a corresponding diminution and contracts, thus drawing a port-ion of the iiuid from the cup D upward into the tube C. This lightens the cup, and it rises, and, through the action of the lever, turns the heat on again, so continuing to move up and down, increasing or de-4 creasing the heat within small limits as required. If it is desired to increase or decrease the heat a few degrees after 'the screw K has been fixed into its place, it may be done by the use of the small weight J. If the heat is f to be decreased, this weight is lhung on the lever between the fulcrum and the cup, its nearness to or distance from the fulcrum determining the amount of degrees. If, on the other hand, it is to be increased, the weight will be hung on the other side of the fulcrnm, where the weight G is iixed. The action of this weight will be to compress or expand the air within the chamber, so'as to retard or advance the rise and fall ofthe lever and cup, until the desired heat is secured. 1 The air-chamberB has a partition, N, extending from the bottom upward far enough to prevent the liquid flowing back into the chamber from the pipe O, if it should'ever be drawn up so high by the contraction of the air.

IOO

, Having thus described my inventiomwhat heat of the incubator, the open outer end of I claim as new, and desire to secure by Letters the pipe C being immersed into the iquid of Patent, is the Said cup, a lever, F, connecting with the i5 As an improved means for regulating the heat-controlling devices of the incubator, and 5 temperature oi" incubators, the combination, secured to the cup, and conntcrba1ancingwith the Stationary air chamber B, located Weights 011 the lever for the cup, as set forth, within the egg-chamber of an incubator, and In Witness whereof I havn hereunto Set my a pipe, C, communicating with the air-chamhand. ber and extending from the same ont through 1o the incubator, of the liquidcontaining cup D, 4YVitnesses:

JAMES M. HALSTED.

located outside of the incubator, so that the S. SAMUELS, liquid therein will not be influenced by the VILL H. BURRALL. 

